US20180241028A1 - Lithium ion battery system having temperature control function - Google Patents
Lithium ion battery system having temperature control function Download PDFInfo
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- US20180241028A1 US20180241028A1 US15/699,075 US201715699075A US2018241028A1 US 20180241028 A1 US20180241028 A1 US 20180241028A1 US 201715699075 A US201715699075 A US 201715699075A US 2018241028 A1 US2018241028 A1 US 2018241028A1
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- United States
- Prior art keywords
- lithium ion
- ion battery
- phase change
- change material
- battery system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 53
- 239000012782 phase change material Substances 0.000 claims abstract description 45
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000006229 carbon black Substances 0.000 claims abstract description 8
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000013078 crystal Substances 0.000 claims abstract description 7
- 239000012188 paraffin wax Substances 0.000 claims abstract description 7
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 7
- 235000010344 sodium nitrate Nutrition 0.000 claims abstract description 7
- 239000004317 sodium nitrate Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims description 34
- 239000002184 metal Substances 0.000 claims description 34
- 239000000741 silica gel Substances 0.000 claims description 8
- 229910002027 silica gel Inorganic materials 0.000 claims description 8
- 229920003023 plastic Polymers 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 239000000499 gel Substances 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- 238000004880 explosion Methods 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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- H—ELECTRICITY
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
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- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/659—Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
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- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
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- H01M50/202—Casings or frames around the primary casing of a single cell or a single battery
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- H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
- H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
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- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
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- H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/271—Lids or covers for the racks or secondary casings
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- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/271—Lids or covers for the racks or secondary casings
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/271—Lids or covers for the racks or secondary casings
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention generally relates to the field of automobile body structures, and in particular, to a lithium ion battery system having a temperature control function.
- a battery system is a core part of an electric vehicle and is formed by connecting many battery cells in series or in parallel.
- a battery generates a relatively significant amount of heat when in use. As a result, the internal temperature of the battery increases rapidly. If the heat cannot be released or absorbed timely, the electrical and thermal characteristics of the cells of the battery may become inconsistent, the service life of the battery is reduced acutely, and even potential safety hazards are possible.
- One prior art solution involves monitoring a temperature of a lithium battery with a battery management system (BMS) of an automobile.
- BMS battery management system
- the BMS system provides an alarm when the temperature exceeds a threshold and stops the lithium battery from operating further.
- the BMS system needs to perform many calculations, resulting in costly and complex implementation.
- phase change material Another prior art methodology involves filling a battery on the side of an automobile with a phase change material, so as to implement temperature control on the lithium battery by utilizing characteristics of the phase change material. Such a manner is simple and cost-saving.
- phase change materials developed for other purposes are mostly used without considering the particularity of usage of such materials in a vehicle battery. Therefore, a temperature control effect that can be achieved is modest, and safety performance is poor.
- a lithium ion battery system having a temperature control function includes a shell, a battery core and a phase change material.
- the battery core is packaged in the shell, the shell is filled with the phase change material which is in contact with a surface of the battery core, and the phase change material includes sodium nitrate with crystal water, paraffin wax, white carbon black, polyacrylamide gel, and trimethylolpropane.
- the shell may include a metal box with an opening on one end and an upper cover, the upper cover is provided with a buckle, the metal box is provided with a boss, and the upper cover and the metal box are connected by means of the buckle and the boss.
- the metal box may be an aluminum alloy metal box.
- the upper cover may further include an anti-explosion valve.
- the upper cover may include a pole lug through hole for the battery core to pass through.
- the upper cover may be made of plastic.
- the plastic may include polypropylene, ABS plastic, and carbon fiber.
- the battery core may include a lithium ion battery cell or a lithium ion battery parallel core.
- the lithium ion battery parallel core may include at least two lithium ion battery cells and heat conducting silica gel, and the lithium ion battery cells are connected to each other in parallel, and are adhered to each other by using the heat conducting silica gel.
- the lithium ion battery system described herein has the following beneficial effects:
- an interior of a shell may be filled with a phase change material including sodium nitrate with crystal water, paraffin wax, white carbon black, polyacrylamide gel, and trimethylolpropane.
- a phase change material including sodium nitrate with crystal water, paraffin wax, white carbon black, polyacrylamide gel, and trimethylolpropane.
- white carbon black is added into the phase change material, the phase change material is in a solid state and is unlikely to leak.
- Such a phase change material can prolong a service life of a battery, so that temperature distribution of the battery is uniform, efficiency is high, and a cooling effect is good. Meanwhile, such a phase change material has flame retardance and high elasticity, and thus can form anti-impact protection for the battery, prevent thermal runaway of single battery from affecting the whole battery system, and form a safety barrier.
- the shell may include a metal box with an opening on one end and an upper cover.
- the metal box and the upper cover are connected by means of a buckle and a boss.
- Such a sealing manner on the one hand, can ensure tightness of the sealing, and on the other hand, is also convenient for disassembly and assembly, as well as filling of the phase change material and inspection on the battery.
- the upper cover may be provided with an anti-explosion valve to prevent a fault caused by an excessive high temperature of the battery when the temperature exceeds a regulation range of the phase change material, thereby improving safety performance of the battery system.
- the metal box may be an aluminum alloy metal box, which has better heat conductivity and is convenient for the battery system to dissipate heat to the outside.
- the upper cover may include a pole lug through hole for the battery core to pass through, two poles of the battery can be connected to the outside to supply power without opening the upper cover.
- the design is convenient, and convenience is enhanced.
- the upper cover may be made of plastic including polypropylene, ABS plastic, and carbon fiber, and has a light weight, high strength, and good stability, so that not only the weight of the shell is reduced, but also firmness of the shell is ensured.
- a lithium ion battery cell or a parallel lithium ion battery core can be selected as the battery core according to actual requirements. Practicability is high, and selection is flexible.
- the lithium ion batteries may be connected in parallel are adhered to each other by means of heat conducting silica gel, so as to facilitate heat exchange among respective lithium ion battery cells, so that the whole battery system is heated uniformly, temperature consistency of the batteries is relatively good, and accidents caused by an excessively high temperature of a single battery is avoided.
- FIG. 1 is a schematic structural diagram of the lithium ion battery system
- FIG. 2 is a schematic diagram of a metal box for the lithium ion battery system
- FIG. 3 is a schematic diagram of an upper cover for the lithium ion battery system
- FIG. 4 is a schematic diagram of a lithium ion battery cell for the lithium ion battery system.
- FIG. 5 is a schematic diagram of a lithium ion battery parallel core for the lithium ion battery system.
- FIG. 6 is a diagram of curves of temperature variation of the lithium ion battery system having a temperature control function and a traditional lithium-ion battery system.
- the lithium ion battery system is described below in detail with reference to drawings and specific embodiments.
- the embodiments are implemented by taking a technical solution of the lithium ion battery system described herein.
- detailed implementation manners and specific operation processes are provided, the protection scope of the lithium ion battery system described herein is not limited to the embodiments below.
- the lithium ion battery system 10 having a temperature control function is shown.
- the lithium ion battery system 10 includes a shell 12 , a battery core 14 (located within the shell 12 as indicated by dashed lines), and a phase change material 16 (located within the shell 12 ).
- the battery core 14 is packaged in the shell 12 .
- the shell 12 is filled with the phase change material 16 which is in contact with a surface of the battery core 18 .
- the phase change material 16 includes sodium nitrate with crystal water, paraffin wax, white carbon black, polyacrylamide gel, and trimethylolpropane.
- phase change material 16 has sealing, insulating, vibration reducing, and flame retarding characteristics, and the phase change material 16 is changeable in shape and presents a stagnant sticky state.
- the shell 12 includes a metal box 20 with an opening 22 .
- the opening 22 is configured to receive the battery core 14 and the phase change material 16 .
- an upper cover 24 is then placed over the opening 22 thereby sealing the battery core 14 and the phase change material 16 within the metal box 20 .
- the metal box 20 may include at least one boss 26 which, as explained later, will interact with a snap of the upper cover 24 thereby securely attaching the upper cover 24 to the metal box 20 .
- the upper cover 24 is provided with a snap 28 .
- the metal box 20 is provided with a boss 26 which is configured to interact with the snap 28 so as to securely attach the upper cover 24 to the metal box 20 , the ceiling the battery core 14 and the phase change material 16 within the metal box 20 .
- the upper cover is further provided with an anti-explosion valve 30 .
- the metal box 20 may be an aluminum alloy metal box.
- the upper cover 24 is further provided pole lug through holes 32 A and 32 B for terminals of the battery core 14 to pass through.
- the upper cover 24 may be made of plastic, and the plastic includes polypropylene, ABS plastic, and carbon fiber.
- FIG. 4 illustrates a situation where the battery core 14 is a lithium-ion battery cell 34 .
- the battery core 14 includes battery cell 34 and terminals 38 A and 38 B extending therefrom.
- the terminals 38 A and 38 B will protrude through the pole lug through holes 32 A and 32 B.
- battery core 14 in this example includes two separate battery cells 34 A and 34 B to form a lithium ion battery parallel core. Between the two separate battery cells 34 A and 34 B is a heat conducting silica gel 40 . The lithium ion battery cells 34 A and 34 B are connected to each other in parallel and are adhered to each other by using the heat conducting silica gel 40 . Additionally, the battery core 14 of FIG. 5 , like that of FIG. 4 , also has two terminals 38 A and 38 B will protrude through the pole lug through holes 32 A and 32 B.
- the schematic diagrams of respective parts of the battery system 10 are as shown in FIG. 2 to FIG. 5 , from which it can be known that the upper cover 24 and the metal box 20 are connected by means of the snap 28 and the boss 26 .
- the phase change material is added into the metal box through the opening of the metal box.
- the phase change material 16 is in direct contact with the battery core 14 .
- the battery core 14 is horizontally placed as a cell 34 or a stacked parallel core 34 A and 34 B.
- the lithium ion battery cells 34 A and 34 B are adhered to each other by using the heat conducting silica gel 40 to form a parallel battery system.
- the lithium ion battery cell 14 or the lithium ion battery parallel core 14 is mounted into the metal box, and two pole lugs 32 A and 32 B face the outside.
- the phase change material 16 is heated into a temperature above a phase change temperature to present a half-flowing state.
- the phase change material 16 is filled into the metal box 20 and is in close contact with a surface of the battery core 14 .
- the upper cover 24 is covered on the opening 22 of the metal box 20 , the pole lugs pass 32 A and 32 B through the pole lug through holes 32 A and 32 B in the upper cover 24 .
- the upper cover 24 is connected to the metal box 20 by means of the snap 28 , and then the battery system 10 is completely assembled.
- the lithium ion battery system 10 having a temperature control function is manufactured according to the foregoing method, and comparative tests are performed on the lithium ion battery system having a temperature control function and a similar lithium ion battery system without being filled with a phase change material, so as to detect performance of the lithium ion battery system 10 having a temperature control function.
- a specific process includes the following: first, placing temperature probes at central positions in the middle of battery cores and outside metal boxes of battery modules; then, charging and discharging the two systems (charging at 1 C and discharging at 3 C), and recording temperature changes in a pending state after the discharging and the discharging is ended, where results are as shown in the following table and FIG. 6 :
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- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Composite Materials (AREA)
- Secondary Cells (AREA)
Abstract
Description
- This application claims priority to Chinese Patent Application No. 201720159465.0, filed on Feb. 22, 2017, the contents of which is hereby incorporated by reference in its entirety.
- The present invention generally relates to the field of automobile body structures, and in particular, to a lithium ion battery system having a temperature control function.
- Automobiles have become indispensable transportation tools for people to travel. Development of conventional automobiles causes some problems such as pollution of the environment from automobile emissions and excessive consumption of petroleum resources. As compared with the conventional automobiles, purely electric vehicles have no emission, do not consume petroleum, and are considered by many to be the future of the automobile. A battery system is a core part of an electric vehicle and is formed by connecting many battery cells in series or in parallel.
- The working conditions of an electric vehicle when traveling are complex. A battery generates a relatively significant amount of heat when in use. As a result, the internal temperature of the battery increases rapidly. If the heat cannot be released or absorbed timely, the electrical and thermal characteristics of the cells of the battery may become inconsistent, the service life of the battery is reduced acutely, and even potential safety hazards are possible.
- Additionally, electric vehicles generally are subject to frequent acceleration and deceleration, and travels in different geographical regions, in which working conditions for travel are complex, and ambient temperatures vary greatly. An excessively low temperature of a battery will cause a reduction in the activity of an electrolyte and an increase in the internal resistance, and consequently, the battery cannot be used. An excessively high temperature of a battery will cause performance of a lithium ion battery to degrade, which will cause a reduction in the cycle life of the battery and increases a probability of thermal runaway. These thermal problems interfere with customer experience, energy density improvement of a battery cell, quick charging, high-rate discharging, improvement of waterproof level, and the like. Therefore, it is critical to implement heat management on the lithium battery.
- There are several developing methodologies for solving the heat problem of a lithium battery. One prior art solution involves monitoring a temperature of a lithium battery with a battery management system (BMS) of an automobile. The BMS system provides an alarm when the temperature exceeds a threshold and stops the lithium battery from operating further. In this method, the BMS system needs to perform many calculations, resulting in costly and complex implementation.
- Another prior art methodology involves filling a battery on the side of an automobile with a phase change material, so as to implement temperature control on the lithium battery by utilizing characteristics of the phase change material. Such a manner is simple and cost-saving. However, existing phase change materials developed for other purposes are mostly used without considering the particularity of usage of such materials in a vehicle battery. Therefore, a temperature control effect that can be achieved is modest, and safety performance is poor.
- A lithium ion battery system having a temperature control function includes a shell, a battery core and a phase change material. The battery core is packaged in the shell, the shell is filled with the phase change material which is in contact with a surface of the battery core, and the phase change material includes sodium nitrate with crystal water, paraffin wax, white carbon black, polyacrylamide gel, and trimethylolpropane.
- The shell may include a metal box with an opening on one end and an upper cover, the upper cover is provided with a buckle, the metal box is provided with a boss, and the upper cover and the metal box are connected by means of the buckle and the boss. The metal box may be an aluminum alloy metal box.
- The upper cover may further include an anti-explosion valve. The upper cover may include a pole lug through hole for the battery core to pass through. The upper cover may be made of plastic. The plastic may include polypropylene, ABS plastic, and carbon fiber.
- The battery core may include a lithium ion battery cell or a lithium ion battery parallel core. The lithium ion battery parallel core may include at least two lithium ion battery cells and heat conducting silica gel, and the lithium ion battery cells are connected to each other in parallel, and are adhered to each other by using the heat conducting silica gel.
- As compared with the prior art, the lithium ion battery system described herein has the following beneficial effects:
- First, an interior of a shell may be filled with a phase change material including sodium nitrate with crystal water, paraffin wax, white carbon black, polyacrylamide gel, and trimethylolpropane. Because white carbon black is added into the phase change material, the phase change material is in a solid state and is unlikely to leak. Such a phase change material can prolong a service life of a battery, so that temperature distribution of the battery is uniform, efficiency is high, and a cooling effect is good. Meanwhile, such a phase change material has flame retardance and high elasticity, and thus can form anti-impact protection for the battery, prevent thermal runaway of single battery from affecting the whole battery system, and form a safety barrier.
- Second, the shell may include a metal box with an opening on one end and an upper cover. The metal box and the upper cover are connected by means of a buckle and a boss. Such a sealing manner, on the one hand, can ensure tightness of the sealing, and on the other hand, is also convenient for disassembly and assembly, as well as filling of the phase change material and inspection on the battery.
- Third, the upper cover may be provided with an anti-explosion valve to prevent a fault caused by an excessive high temperature of the battery when the temperature exceeds a regulation range of the phase change material, thereby improving safety performance of the battery system.
- Fourth, the metal box may be an aluminum alloy metal box, which has better heat conductivity and is convenient for the battery system to dissipate heat to the outside.
- Fifth, the upper cover may include a pole lug through hole for the battery core to pass through, two poles of the battery can be connected to the outside to supply power without opening the upper cover. The design is convenient, and convenience is enhanced.
- Sixth, the upper cover may be made of plastic including polypropylene, ABS plastic, and carbon fiber, and has a light weight, high strength, and good stability, so that not only the weight of the shell is reduced, but also firmness of the shell is ensured.
- Seventh, a lithium ion battery cell or a parallel lithium ion battery core can be selected as the battery core according to actual requirements. Practicability is high, and selection is flexible.
- Eight, the lithium ion batteries may be connected in parallel are adhered to each other by means of heat conducting silica gel, so as to facilitate heat exchange among respective lithium ion battery cells, so that the whole battery system is heated uniformly, temperature consistency of the batteries is relatively good, and accidents caused by an excessively high temperature of a single battery is avoided.
- Finally, respective parts of the whole battery system may all be easily machined and have low prices, thereby greatly saving manufacturing costs of the battery system.
- Further objects, features, and advantages of this invention will become readily apparent to persons skilled in the art after a review of the following description, with reference to the drawings and claims that are appended to and form a part of this specification.
-
FIG. 1 is a schematic structural diagram of the lithium ion battery system; -
FIG. 2 is a schematic diagram of a metal box for the lithium ion battery system; -
FIG. 3 is a schematic diagram of an upper cover for the lithium ion battery system; -
FIG. 4 is a schematic diagram of a lithium ion battery cell for the lithium ion battery system; and -
FIG. 5 is a schematic diagram of a lithium ion battery parallel core for the lithium ion battery system; and -
FIG. 6 is a diagram of curves of temperature variation of the lithium ion battery system having a temperature control function and a traditional lithium-ion battery system. - The lithium ion battery system is described below in detail with reference to drawings and specific embodiments. The embodiments are implemented by taking a technical solution of the lithium ion battery system described herein. Although detailed implementation manners and specific operation processes are provided, the protection scope of the lithium ion battery system described herein is not limited to the embodiments below.
- As shown in
FIG. 1 , a lithiumion battery system 10 having a temperature control function is shown. The lithiumion battery system 10 includes ashell 12, a battery core 14 (located within theshell 12 as indicated by dashed lines), and a phase change material 16 (located within the shell 12). Thebattery core 14 is packaged in theshell 12. Theshell 12 is filled with thephase change material 16 which is in contact with a surface of thebattery core 18. Thephase change material 16 includes sodium nitrate with crystal water, paraffin wax, white carbon black, polyacrylamide gel, and trimethylolpropane. Sodium nitrate with crystal water accounts for approximately 20%, paraffin wax accounts for approximately 30%, white carbon black accounts for approximately 10%, polyacrylamide gel accounts for approximately 5%, and trimethylol propane accounts for approximately 35% in weight. Thephase change material 16 has sealing, insulating, vibration reducing, and flame retarding characteristics, and thephase change material 16 is changeable in shape and presents a stagnant sticky state. - Referring to
FIGS. 1 and 2 , theshell 12 includes ametal box 20 with anopening 22. Theopening 22 is configured to receive thebattery core 14 and thephase change material 16. Once thebattery core 14 and thephase change material 16 is placed within themetal box 20, anupper cover 24 is then placed over theopening 22 thereby sealing thebattery core 14 and thephase change material 16 within themetal box 20. Themetal box 20 may include at least oneboss 26 which, as explained later, will interact with a snap of theupper cover 24 thereby securely attaching theupper cover 24 to themetal box 20. - Referring to
FIG. 3 , a more detailed view of theupper cover 24 is shown. Here, on at least one end of anupper cover 24, the upper cover is provided with asnap 28. As stated previously, themetal box 20 is provided with aboss 26 which is configured to interact with thesnap 28 so as to securely attach theupper cover 24 to themetal box 20, the ceiling thebattery core 14 and thephase change material 16 within themetal box 20. - The upper cover is further provided with an
anti-explosion valve 30. Themetal box 20 may be an aluminum alloy metal box. Theupper cover 24 is further provided pole lug throughholes battery core 14 to pass through. Theupper cover 24 may be made of plastic, and the plastic includes polypropylene, ABS plastic, and carbon fiber. - Referring to
FIGS. 4 and 5 , a more detailed view of thebattery core 14 is provided.FIG. 4 illustrates a situation where thebattery core 14 is a lithium-ion battery cell 34. Here, thebattery core 14 includesbattery cell 34 andterminals metal box 20 and covered with theupper cover 24, theterminals holes - As best shown in
FIG. 5 ,battery core 14 in this example includes twoseparate battery cells separate battery cells silica gel 40. The lithiumion battery cells silica gel 40. Additionally, thebattery core 14 ofFIG. 5 , like that ofFIG. 4 , also has twoterminals holes - The schematic diagrams of respective parts of the
battery system 10 are as shown inFIG. 2 toFIG. 5 , from which it can be known that theupper cover 24 and themetal box 20 are connected by means of thesnap 28 and theboss 26. The phase change material is added into the metal box through the opening of the metal box. Thephase change material 16 is in direct contact with thebattery core 14. When thebattery system 10 is assembled, thebattery core 14 is horizontally placed as acell 34 or a stackedparallel core ion battery cells silica gel 40 to form a parallel battery system. The lithiumion battery cell 14 or the lithium ion batteryparallel core 14 is mounted into the metal box, and twopole lugs - The
phase change material 16 is heated into a temperature above a phase change temperature to present a half-flowing state. Thephase change material 16 is filled into themetal box 20 and is in close contact with a surface of thebattery core 14. Finally, theupper cover 24 is covered on theopening 22 of themetal box 20, the pole lugs pass 32A and 32B through the pole lug throughholes upper cover 24. Theupper cover 24 is connected to themetal box 20 by means of thesnap 28, and then thebattery system 10 is completely assembled. - The lithium
ion battery system 10 having a temperature control function is manufactured according to the foregoing method, and comparative tests are performed on the lithium ion battery system having a temperature control function and a similar lithium ion battery system without being filled with a phase change material, so as to detect performance of the lithiumion battery system 10 having a temperature control function. A specific process includes the following: first, placing temperature probes at central positions in the middle of battery cores and outside metal boxes of battery modules; then, charging and discharging the two systems (charging at 1 C and discharging at 3 C), and recording temperature changes in a pending state after the discharging and the discharging is ended, where results are as shown in the following table andFIG. 6 : -
TABLE 1 Impacts of having a phase change material or having no phase change material on stability of a battery system: Battery core interior Shell surface Temperature Temperature Temperature rise rate Highest Temperature rise rate Highest rise (° C.) (° C./s) temperature rise (° C.) (° C./s) temperature Having 20.26 0.017 48.89 18 0.015 46.1 a phase change material Having 15.54 0.012 43.62 6 0.005 32.5 no phase change material - From Table 1 and
FIG. 6 , it can be seen that an internal temperature can be reduced if thebattery core 14 is filled with thephase change material 16. After thephase change material 16 is added, heat is stored in thephase change material 16, and a temperature rise of amodule shell 12 is not obvious, so that a quick rise of the internal temperature of thesystem 10 can be avoided when the battery works at a large current, and the battery can be kept in optimal working condition. - As a person skilled in the art will readily appreciate, the above description is meant as an illustration of the principles of this invention. This description is not intended to limit the scope or application of this invention in that the invention is susceptible to modification, variation and change, without departing from spirit of this invention, as defined in the following claims.
Claims (8)
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CN201720159465.0 | 2017-02-22 | ||
CN201720159465.0U CN206558645U (en) | 2017-02-22 | 2017-02-22 | A kind of lithium-ion battery systems with function of temperature control |
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US15/699,075 Abandoned US20180241028A1 (en) | 2017-02-22 | 2017-09-08 | Lithium ion battery system having temperature control function |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113078379A (en) * | 2021-03-12 | 2021-07-06 | 天津市捷威动力工业有限公司 | Method for positioning abnormal temperature area of lithium ion battery |
WO2023009550A1 (en) * | 2021-07-30 | 2023-02-02 | Ohio State Innovation Foundation | Device and method for vibration free low temperature sample holder for side entry electron microscopes |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN117766908A (en) * | 2023-12-11 | 2024-03-26 | 武汉理工大学 | Low-temperature heat management system and battery of solid-solid composite phase change material embedded lithium battery |
-
2017
- 2017-02-22 CN CN201720159465.0U patent/CN206558645U/en active Active
- 2017-09-08 US US15/699,075 patent/US20180241028A1/en not_active Abandoned
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113078379A (en) * | 2021-03-12 | 2021-07-06 | 天津市捷威动力工业有限公司 | Method for positioning abnormal temperature area of lithium ion battery |
WO2023009550A1 (en) * | 2021-07-30 | 2023-02-02 | Ohio State Innovation Foundation | Device and method for vibration free low temperature sample holder for side entry electron microscopes |
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